Machine for straightening, drawing, and polishing rods



H. MOLLER Get. 9, 11934.

MACHINE FOR STRAIGHTENING, DRAWING, AND POLISHING RODS Filed May 16,1931 4 Sheets-Sheet l H. MULLER 1,976,357

AND POLISHING RODS Oct. 9, 1934.

MACHINE FOR STRAIGHTENING, DRAWING,

Filed May 16, 1931 4 Sheets-Sheet 2 m m WWW/M H. MGLLER Oct. 9, 1934.

Filed May 16, 1931 4 Sheets-Sheet 3 H. MGLLER Oct 1934.

Filed ma 16, 1931 4 Sheets-Sheet 4 ill Patented on. 9,1934

UNITED STATES.

PATENT OFFICE] v mom son s'rnAIGn'rENmG, DRAWING,

AND POLISHING RODS Heinrich. Miiller, Ergste, near Schwerte, Germany,assignor to the firm Schumag Schumacher Metallwerke- Aktien-Gesellschaftfur v Pra'zisionsmechanik, Aachen, Germany 7 Application May 16, 1931,Serial Ida 537,91? In Germany May 16, 1930 4 Claims. (01. za-ss) Thisinvention relates to a double acting and automatic machine forinserting, drawing, .straightening and polishing rods. e

A single acting automatic drawing machine is I known, in which, the wireisdrawn and cut to length by a cutting device arranged behind thedrawing carriage. The rods are then automatically pushed forward singlythrough the cutting device by the following rods to a straightening l0and polishing machine and are then deposited in a collecting vessel. Thereciprocating movement is effected by a reversing gear with acceleratedreturn motion.

A disadvantage of this construction is, that the II return movement ofthe drawing. carriage is ef-..

2 slightly bent or cut crooked, the two rods will F slide past oneanother and neither will hated to -the straightening and polishingmachine.

; 1 It is also known to emove the rods singly from the deepest point ofp ckling troughs with transversely inclined bottom surface by means ofend less chains with grippers, to further treat these rods and feed sameto the draw plate of the draw bench on a continuously moving conveyor.The pointed end of the rod projects through the draw 5 plate'anddisengages the draw bench by vaspecial device. bench works with twodrawing car-. riages operative alternately inthe working position andwhich, duringthe working operation, are

coupled with a continually circulating endless.

drawing chain, whereas the drawing carriage, which is not working, isreturned to its initial position on a side path. The finished drawn roddrops on to the drawing chain and is moved on thereby and fed by anotherconveyor; to shears, which cut off the pointed end. A further conveyorserves for depositing the finished drawn material into receptacles. Nomeans for polishing and straightening of the drawn material are pro-5ovided.-.- v

This machine is open to the objection .that the drawing carriage, whichis notoperative, is brought back to its initial position in acomplicated manner outside the working path.

Further, by/the throwing off of the already 'drawn rods on to thedrawing chain, the chains may be damaged.

The return movement of the drawing carriage may be effected rapidly,independent of the gearing. Finally, the output of the machine isincreased by the provision of two drawing tongs on the drawing carriage.

An embodiment of the invention is illustrated by way of example in theaccompanying drawings in which: u Figs. 1 and 1a show the machine inside eleva- Fig. 2 is a section through the feeding device on line 2-2of Fig. 3.-

Figs. 3 and 31: show the machine in top plan 7 view.

The feeding device A is arranged front of the drawing bench B proper.Two U-girders 22, fixed at their ends in the frame-oi the drawbench Band on fiat bars 23 (Fig. 2) whichform the frame. The rods to be drawnlie flat on inclined bars a fixed to the frame and resting on a bar 24(Fig.3) mounted onthe uprights 25 (Fig. 2). In order-to prevent the rodsfrom lying trans-' versely one above the other, they are held by flatbars 12. The disc-shaped catches 0 take the rods singly out of the pairsof flat bars a and b by means of fingers d and place them on acirculating band I. The speed of rotation of the catch 0 is so regulatedthat one revolution corresponds to one reciprocating movement of thedrawing carriage s, which is obtained in that the drive of the catchshaft 26 is effected indirectly by the draw chain it which drives thetoothed wheel 40. The endless band I is driven by a shaft 27.with discs28 keyed thereon and it runs over rollers 29 in a trough e. Catches aare fixed on the bands I.

The double draw bench B connected to the feeding device A rests with itsU-girder frame 33 on two cast iron columns 31 and 32. Wheels r and q ofthe drawing carriage s run between two flat bars fixed on the webs ofthe U-girders 33. Two draw tongs p are fixed on the plate of the drawingcarriage and can only open until the arms 3 ofthetongs strike against anabutment 8. Two slots]. are provided symmetrically hi the plate, andcatches t, rigidly connected to the drawing chain it and shifting thedrawing carriage, engage in these slots. 'Further, a-fiat bar 19 isfixed on the plate,-which throws over a lever 20 of a switch 21 andstops the driving motor, when the drawing carriage has travelled beyondits extreme position. The angle irons 17 on the plate strike thenagainst the stops 15 and move the slide 16 through the intermediary ofthe commencement of the drawing are guided by.

a funnel-shaped extension 30 into a draw plate a mounted in a holder 22,the pointed ends of the rods projecting so far from the funnel-shapedextensions that they can be gripped by the drawing tongs.

The following parts are mounted on the frame 33; two springs 18, aresilient device 2, which will be hereinafter described, for tensioningthe tongs, resilient abutments 4 for opening the tongs p, the

switch 21 and the trough 5, into which the drawn rods drop. One column32 of the draw bench stands on a foundation plate 35 with a drivingmotor 36 and its gearing 37, and also two straightening machines, whichare driven by two like motors 38. The finished rods are ejected throughthe tubes 39 into a collecting receptacle.

The machine operates in the following manner:

The rods to be drawn and already pointed are placed fiat,on the inclinedguide bars a on each side of the draw bench b. The disc-shaped catch cwith finger d removes the rods singly from the feeding frame and placesthem in the feed groove 6 for the endless band on which the catches gare fixed which feed the rods through the funnels 30 into the drawplates 2. The drive of the catch 0 is effected by a worm gearing itthrough the intermediary of belts i and shaft is, which also drives theendless band 1 through the intermediary of a belt Z and is itself drivenby a drawing chain u through the intermediary of the toothed wheel '40with shaft to and chain n. The drawing carriage s, equipped with twodrawing tongs p and guided laterally and also on the top and on thebottom on rollers q and 1', is coupled to the draw bench chain 11,during the drawing by two catches t which engage in the slots 1fromunder the carriage plate.

This operation takes place in the following manner. During the rotationof the draw chain u, which is always in the same direction, the catchest on and rigidly connected to the draw chain it, describe an arc inpassing from the lower bight of the chain when being guided over thesprocket wheel and extend vertically upwards like two fingers, whichhere'engage slots 1 in the plate of thedraw carriage s and transport thesame. At the end of the draw pass, that is when the catches are againconveyed on to the lower bight of the draw chain, the fingers swing outof the slots 1 of the plate of the draw carriage s.

For the purpose of supporting the catches andof preventingthe sagging ofthe upper bight of the draw chain u, single guide bars 43 are providedon both sides thereof which engage laterally the upper bight of thechain and on which the lower surfaces on the catches t bear. After thedrawing the weight loaded chain 10 moves the drawing carriage s in frontof the draw plate holder 1), in front of which two flat springs 34 arearranged as buffers. These tongs 1) each comprise two intersectinglevers p which are hingedly connected at their point of intersection byan axle 42, each lever carrying a jaw 12 at one end. One of these leversp is hingedly connected at its other end to an arm 3 pivotally mountedintermediate of its-length on a pivot pin 42a fixed on carriage s, theother end of the second lever being hingedly connected to this pivot pin42a by means of a link 12 At the end of the return movement of thecarriage resilient toes 41 (Fig. 1) bear against the axles 42 of thetongs thus forcing these axles towards the pivot pin 42a and spreadingthe levers 12 thus opening the jaws p of the tongs to their full extent.The toes 41 then yield and slide over the axles 42. The carriage s isthen connected with the drawing chain u by the catch t and commences itsdrawing movement whereupon these toes 41 engage behind the axles 42 andpull the same away from the pins 42a thus causing the jaws p to closeand grip the pointed rods projecting from the draw plates 2. These toes41 then againyield and slide over the axles 42. The tongs are preventedfrom opening too far by the free ends of the arms 3 coming into contactwith the abutments 8. 'These tongs p are described in de-. tail inGerman Patent 450,331.

After the rods have been drawn, the arms 3 of the tongs strike againstthe resilient stops 4 and open the tongs'p, the abutments 8 fitted onthe carriage, preventing thetongs from opening wide. The drawn rods,drop by gravity into the troughs 5, arranged one on each side of themachine. In this extreme position the swing out catches t, which are nolonger held on the slide-path 43 (Fig. 3), disengage automatically fromthe drawing carriage s and continue to move on with the chain u. Thedrawing carriage s is returned into its initial position by the weightshifting in a tube, with the chain 10, running over rollers 11 and 12,after which the working operation commences afresh.

During the fresh operation the rods, already drawn during the precedingoperation and lying inthe troughs 5, are at the same time pushed intothe straightening and polishing machine C through the funnel 6 and guidetube '7, by means of the oscillatable catches 13 arranged under thedrawing carriage s, and then drop into the collecting receptacle. Inorder to enable these rods to be always reliably gripped by the catches13, as'pecial arrangement is provided. On both sides of the draw bench Brods 14 are arranged longitudinally shiftable in rigid bearings on theouter vertical flanges of the U-shaped troughs 5. On one end, namelythat adjacent the straightening and polishing machine C the rods 14 areprovided with an abutment or finger 15 extending upwards at rightangles. On the other ends the rods carry a slide 16 likewise bent atright angles but extending horizontally, which slide rests with itsunder surface on the bottom of the trough. The drawn rods do not dropvertically into the troughs but, owing to theirkinetic energy, moveslightly forwards so that they come to lie with their end in front ofthe slides 16.

The slides 16 lie as near as possible to the draw bench so that thedrawn rods do not fall onto the slide but in front of same.

Shortly before the draw carriage reaches its extreme position which itassumes slightly later than, that is after, the opening of the tongs p,the abutment 17 projecting vertically downwards from the under side ofthe draw carriage comes into contact with the finger 15 of the rod 14and transports the same. The rod 14 is therefore shifted in the drawingdirection with the slide 16, the drawn rods being shifted ona shortdistance in the trough 5. During the next drawing operation of the drawcarriage the rods drawn in the previous pass and lying in the trough 5in the manner above explained are gripped icy the catches 13 oi the drawcarriage and pulled in the direction or the polishing machine C.

In order to prevent the catch 13 from engaging the drawn rods andpushing them backwards in the trough 5 during the return movement of thecarriage the catch 13 is arranged to swing up in the direction of thearrow shown in i. As thiscatch cannot however swing up in the oppo= sitedirection it will drop and engage behind the rods and push them alongthe trough 5 into the polishing machine C during the outward movement ofthe carriage away from the die head. The spring is pulls the rod l withthe slide is and finger l5 hack into the initial position. In the eventof the drawing carriage running heyohd extreme position, the fiat barill strikes agalhst the lever 2c of the switch 21 and cuts out thedriving motor. After leaving the straightening and polishing machine thefinished rods drop automatically into the collecting receptacle.

I claim:

1. An automatic machine for drawing straightening, and polishing rods,comprising in combl= nation a double draw bench having two draw plates,feeding devices arranged one at each side of said draw bench adapted tofeed the rods to be drawn to said draw plates, two drawing tongs adaptedto grip the pointed ends of the rods projecting from said draw plate, adraw carriage carrying said two drawing tongs, means for clos-= ing andopening said tongs in dependency upon the forward and backward movementsof said carriage, an endless drawing chain adapted to move forward saidcarriage at regular intervals, a weight adapted to return said carriageinto its initial position along its working path after the drawingoperation and disengagement of said drawing chain, troughs arranged oneon each side of said drawing chain into which the rods drop afterdrawing, a straightening and polishing ma.- chine at the end of each ofsaid troughs, and means for feeding the rods which have dropped intosaid troughs to said straightening and polishing machines actuated bysaid drawing carriage moved forward during the next drawing operation.

2. A machine as specified in claim 1, comprising in combination with thedraw bench, two storage frames arranged one on each side in front ofsaid draw bench, and catches with fingers arranged above said framesadapted to remove the rods singly from said storage frames.

asst 3' "2 in a machine for straightening and polishing rods, forfeeding the rods as spechled in claim 1, comprising in combination withthe draw beach the carriage, the troughs, and the means for feeding therods, said means comprising two slides arranged one at each side of saidcarriage in said troughs adapted to push toward the rode a certaindistance after the drawing, two rod systems each composed of a rod witha finger extehdihg one along each side of said draw loehch and carryingone or said slides, an abutment on each side oi said carriage adapt-edto control said slides through the intermedian; of said rod system, andoscillatable catches on said carriage adapted to reliably grip arid feedon the rods pushed forward by said slides.

4. In an automatic machine for drawing, strai htening and polishin rods,the combine, tion of a double draw hench, draw plates at one end or saidbench, a carriage on said bench, means for moving said carriagebackwards and torwards along said draw loehch, tongs mounted on saidcarriage and each including a pair of jaws, a pair oi intersectinglevers each carrying one of said jaws, an aide hingedly connecting saidpair of lovers, a pivot pin in said carriage, an arm mountedintermediate of its length on said pin and connected at one end to oneof said levers, and a link connecting the other of said levers to saidpivot pin, two resilient abutments one for each of said tongs at theother end of said bench each adapted to loear against the free end ofsaid arm to open said tongs at the end of the drawing movement of thecarriage, resilient toes arranged at the end of said bench adjacent saiddraw plates said toes adapted to bear against said axles of said tongsto fully open said tongs and to slide over said axles at the end of thereturn movement of said carriage and to engage loehind said axles toclose said tongs at the commencement of the drawing movement of saidcarriage and to finally again slip over and release said axles duringthe further drawing movement of the carriage, and two abutments on saidcarriage one for each of said tongs adapted to bear against the free endof said arm and limit the opening movement of said tongs.

HEINR. Mouton.

